Two hours total GLP-1 increments (∆GLP-1) following OGTT reduced significantly in T2DM (4.26 ± 6.27 pmol/L) group compared to NGT (12.37 ± 10.05 pmol/L) and isolated IFG (10.37 ± 9.82 pmol/L) or IGT (9.79 ± 10.50 pmol/L) groups [10]. This evidence concerns the gene GCG and type 2 diabetes mellitus.